24 August 1944:
At about 0700, LtCdr Henry S. Monroe's (USNA ’33) USS RONQUIL (SS-396) torpedoes and hits and sinks YOSHIDA MARU No. 3 with 96 out of 99 troops, 10 Ship’s Gunners and all 70 of the crew being KIA. At about the same time, Monroe torpedoes and damages FUKUREI MARU with troops, coal and war supplies aboard. She floods and drifts ashore where she is abandoned about three months later. 210 of the 1445 troops on board and four of the crew are killed.

6 September 1944:
At 0230, KOGYO MARU develops engine troubles and turns back. At 0423, EIJI MARU strikes mines twice at 22-19N 120-30E. HIBIKI comes alongside, but is damaged in the bow by another mine and forced to return to Takao. At 0800, as HIBIKI pulls away, EIJI MARU is rocked by a third mine explosion and quickly sinks. She was carrying 2,345 troops including the 1st and 2nd Battalions from the 31st Infantry Regiment, the division’s 1st Battalion, 8th Artillery, the 4th Company of the transportation regiment, and water purification troops; also sharing space aboard were men from of the 2nd Tank Division, elements of the 1st Battalion, 2nd Mobile Artillery, 1st Battalion, 2nd Mobile Infantry, and combat engineers, horses, weapons and ammunition. 611 men troops and six crewmen are KIA. The convoy withdraws to Tungchiang. EIMAN MARU suffers engine problems, is detached and returns to Takao, probably escorted by CH-63.

5 October 1944:
At about 1300, LtCdr James A. Adkins' (USNA ’26) USS COD (SS-224) torpedoes and damages ATSUTA MARU. Then at 1420, Adkins torpedoes and sinks TATSUSHIRO MARU at 13-02N 120-16E. Two crewmen and unknown number of the 500 troops she was carrying are KIA.

21 November 1944:
Arrives back at Port Blair and departs later that day.

26 November 1944:
Arrives at Penang.

27 November 1944:
Departs Penang.

29 November 1944:
Arrives at Singapore.

7 December 1944:
Departs Singapore.

10 December 1944:
Arrives at Sabang.

12 December 1944:
At 1150 departs Sabang with CH-7 escorting DAICHO MARU.
15 December 1944:
At 1035 DAICHO MARU and CH-7 arrive at Singapore. It is possible CH-63 arrives with them and then immediately departs or meets a northbound oil convoy en route to Belawan.

31 December 1944:
At 0800 CH-34, CH-35 and CH-63 depart Port Blair escorting a convoy consisting of UNRYU and TESHIO MARUs.Three hours after leaving port UNRYU MARU is torpedoed and sunk by HMS SHAKESPEARE with only two watchman surviving. 149 passengers and the ship's crew are KIA.

25 March 1945:
E of Khota Andaman. At 1030, the convoy is intercepted by Captain (later Admiral Sir) Manley L. Power's 26th Destroyer Flotilla consisting of destroyers HMS SAUMAREZ, HMS VIRAGO, HMS VIGILANT and HMS VOLAGE. At 1059, the destroyers open fire on the convoy with gunfire and launch eight torpedoes, all of which miss.

The undamaged convoy makes for the southwest. At 1129, Captain Powers radios for air support. Two RAF Consolidated B-24 “Liberator” bombers soon arrive and in a low-level bombing attack sink TESHIO MARU, but one B-24 is caught in the blast of its own bombs and crashes into the sea. 11 passengers and 11 of the crew are killed.

At 1150, the 26th Destroyer Flotilla renews its attack on the convoy and HMS VOLAGE sinks RISUI MARU at 10-38N, 94-42E. 21 of the crew are KIA. HMS SAUMAREZ rescues the downed B-24's crew. At 1230, HMS VIRAGO and HMS VIGILANT open fire at long range on CH-63 and CH-34. HMS VIGILANT closes and fires eight torpedoes at the subchasers, one of which hits and sinks CH-63.